Configure baseURL for GitHub Pages deployment

[Copilot]

GitHub Pages serves the app at kehwar.github.io/wallet/ but assets were requested from root, causing 404s.

Changes

• nuxt.config.ts: Set app.baseURL: '/wallet/' to prefix all asset paths
• PWA manifest: Changed start_url from / to ./ for relative resolution
• Service worker: Updated navigateFallback to /wallet/ for correct routing

Result

Generated assets now reference correct paths:

<!-- Before -->
<link href="/_nuxt/entry.Bniov9FE.css">

<!-- After -->
<link href="/wallet/_nuxt/entry.Bniov9FE.css">

Original prompt

Deploy action to github pages results ok

But on opening the site I get

wallet/:1 GET https://kehwar.github.io/_nuxt/entry.Bniov9FE.css net::ERR_ABORTED 404 (Not Found)
wallet/:1 GET https://kehwar.github.io/_nuxt/CleRJAhL.js net::ERR_ABORTED 404 (Not Found)
favicon.ico:1 GET https://kehwar.github.io/favicon.ico 404 (Not Found)

and a blank page

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